US1023557A - Multiple telephone-transmitter. - Google Patents

Description

G. B. EGNER & J; G. HOLMSTBD M. MULTIPLE TELEPHONE TRANSMITTER. rum-r10: 11mm mm. m, 1209.

1,023,557, Patented Apr. 16, 1912.

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Specification Letters Patent.

Patented Apr. 16. 191 2.

Aii nmuon am n w 1a, was, Serial in. 512,409.

known that..we, {Jenn Eran, FxGNlFlH, a subjeet of theKing of Sweden, and vesi- Elf; file giui igflfln fifilstmkhol-mi in gdoino ffiu eden, andJmmN GLXXAR Homrs'rnihn a subject oftheKing of Sweden,

l have invented certain i resistanee int .aeitv of IHlUJUH'SlI'OIl" currents are i nah i u i n a I new and "useful "Improvementsin Multiple 1 0 llglephone-Trimamitters, of whieh the follle S I]0CGSS&l1fy for a :powerful telephone atrnnsmitter. In order to attain as great fl-Jl'n lllGllSllfi possible in the ll'rmsll'fillt'l' i h wi th'out too great normal i'esis'tail-(te two or g series. as well known.

more transmitter have been emmeeted in The effect of such a connection of the-tranemilters however often in 1C5}; than that of a single tranmuitter due l to .1'e:1 pn easily understood. Owing to the fart'tlialthe dislanees between the mouth of g the telephoning permu and the diapln'uum ofiphetransn ittefl are not exartly the same am the qualities of the diupln'an'rns and the wells ofjhe transmitterare dill'erenl. how ,t'dft'l;Jifllftilhll) the mild purl-s are inarnlfartilreql. in lmrherenee iirthe eleetri-c,oeeillatimis L effected. whirl) reduees the result of the -i:i iperutiq n of the trausmitt-m'. .Sno'tlier arrangement for the same ]nnpo.-:econsists in Providing two or more transmitters he hind the name diaphragm. .llul the result of the jiillll-.;ll'l'1lllfi't'llll'lll' haw hitherto not been )HllbfflClOlj' due l'i the impossibility of ruusill g tlnlHHJHllllf-(l' eells to euiiperale. The uuid diiuphrmn i. divided inluisonornuis' figurw. .m that ditl'ereut parts of the d n pln'ugm weillale in a difl'erel-it \\'uat the same moment.

50 ward at another cell during the same moment. thus reducing the prewu're against the carbon granules of that cell and increasing the resistance which results in the said cells counteracting each other and the object aimed at being missed. The said lack of cooperation of the cells of multiple transmittiers hitherto used can, evidently, not'be removed adg'usting the pressure between the mutants of the cells.

invention relates to a transmitter with two or more cells so constructed that the cells are caused to coiiperate, which object is aimed by combining the cells with a strai diaphragm. By straining the diaphragm it"in caused to oscillate uniformly and ranch manner that it oscillates with the greater-.1 amplitude at its center part. The cells are so arranged that they receive and taransiorm into variations of the elwtric resistance the ver) same vibrations, made by the neuter part of the diaphragm, so that there is a perfect synchronism in all the eells. Owing to the said syrvhronism it is poysible to so adjust the [)l't sure between the contacts of each cell that the sum ofrthe aet ions of the cells is a maximum.

The :n-rompanying drawing shows in a rims setrlimi part of a multiple transmitter arranged in aecordanre with this invention.

The diaphragm 1 is jammed between the easing 52 of the transmitter and a ring 3,

lined to the easing in any suitable manner.

4 is a ring-shaped inner edge of the casing 2. agaiimt which the diaphragm 1 in bearing. The straining of the diaphragm is effected a ring 5 forcing the diaphragm into the groove ohetween the edge 4 and the wall of the (a-sl ng 2. The said ring 5 is forced inward by means of tlnunb-nuts 7 or in any other suidarh-le manner and strains theidiaplrragm mrifnrmly from its (miter outward. [unread of fii'xh-rg each of the movable electrodes of the cells separately to thediaplnrzrgiu 1. a disk 8 is fixed to the diaphragm by meamn of a screw pin 5) at the center of the same. At the periphery of the said disk 8 a plurad iity of electrode (links or pieces 10 i are fixed one of which is shown in the draw- 17 of our ofl lie eells ill beredueed owing m 1 and full synehroniem at all the ing. A hollow perforated cylinder 11 of steel or any other hard material is mounted between the disk 8 and the diaphragm 1. (knlse'q uenfily. the said disk 8 with the electrode 10 will vibrate just in the same manner as the center part of the ('liafhragm isks 10 will be attained so that the said disks 10 more downward simultaneously and upward simultaneously, thus effecting the same variations in all the cells during the same periods. The electrode disks 10 are insulated filom the disk 8 and mutuall and are gonnected.

by conductors 12 with the insulated clamping nuts 13 on the outer side of the diaphragm 1. Each of the electrodes 10 ex tends downward into a subjacent' cup 14. The said cups, which form the other electrode of the respective cells, are insulated mutually and from the other parts of the apparatus, the cups being for that reason supported by plungers 15, fitting in cylinders 16, which are mounted in a plate 17 of an insulating material and common to all the said cylinders 16. Each of the cups 14 can be adjusted with relation to the electrode 10 z'. e. the pressure between the electrode 10 and the carbon granules 18 in the cup can be adjusted to the most suitable one. As a screw 19 hearing against the lower end of the plunger 15 is moved inward the plunger 15 and the cup 14 are raised, and as the screw is moved outward the plunger 15 and the cup 14 will follow the same owing to the pressure of a spring 20 fixed to a stationary part of the apparatus and acting downward upon the plunger 15. The said spring 20 also serves as a conductor between the cup 14 and the respective outer contact or clamping nut 21.

l/Vhen the described transmitter is to be adjusted the cells are separately and in turn connected with the circuit and adjusted by means of the corresponding screw 15), so that the greatest elt'ect is gained. in order that absolutely the same adjustment, may be .made 111' all the cells the said adjusting operation must be effected in such'manner, that after each of the cells has once been adjusted the adjusting operation is again started with the first cell and is then continued cell by cell, thesaid operatidn being thus repeated two or three times. In the said manner the cells are caused to cooperate exactly and a specially great effect is gained.

\Vhen each of the cells has been adjusted in the described manner by means of the screw 19, so that there is the same pressure in all the cells, it may be necessary during the operation of the transmitter to some what increase or decrease the said pressure. The adjusting of'each cell separately for the said purpose would. evidently, be very timeconsinning and un'practical, as each cell then must be adjusted at least twice. For that reason the transmitter in question is provided with a de ice, by HIGH-1130f which all'the cells can be uniformly and simultaneous y adjusted, after the same pressure has beeircffected in all the cells. For the said purpose the insulating plate 17, supporting all the plungers 15 of the cups or cells 14 can be moved 11 Ward and downward (without being rotated by rotatingaring22. The said ring 22, which can be rotated horiz0ntally, is prevented from moving verti cally by screw-pins 23, engaging a groove provided in a stationary boss 21 inclosing the plate 17. A screw-threaded ring 25 fixed to the plate 17 and engaged by the ring 22 is caused by the rotated ring 22 to move vertically parallelly to itself, thus raising or lowering the plate 17 and all the cups 14. The plate 17 is prevented from rotating by the springs 20 and by one or more vertical ribs 26 engaging grooves 27 provided in the said boss 24, for instance.

Having now described our invention, what we claim as new and desire to secure by Letters Patent is:

1. In multiple telephone transmitters, the

combination of a diaphragm uniformly' strained from its center toward its periphery, a disk firmly secured to in-eXtended surface of the central portion of the diaplu'agm, substantially as great as the said disk, and a plurality of rigid members fixed to the said disk and forming one of the electrodes of respective transmitter cells.

2. In multiple telephone transmitters, the ron'ihiuation of a diaphragm uniformly strained from its center toward its periphcry, a disk fixed to the center part. of the diaphragm, an interposed piece of hard material between the diaphragm and the said disk. and of substantiallythe same diameter as the disk, the said interposed piece bearing with its ends against the diaphragm and the disk respectively, and a plurality of rigid members fixed to the aforesaid disk and forming one of the electrodes of respective transmitter cells.

3. [n telephone transmitters, the combination of a diaphragm uniformly strained outward from its renter, a plurality of members forming one of the electrodes of respectivc transmitter cells, a disk fixed to the center part of the diaphragm and supporting the said electrode-members, and a hollow interposed piece of hard material between the diaphragm and the said disk, and arranged like a grating, substantially as described and for the purpose set forth.

in witness whereof. we have hereunto igned our names in presence of two subscvibing witnes es.

CARL run. sorta. JHHAN GUNNAR HOLMSTROM.

Witnesses:

ANNA [.tinrusrutim, Ronirirr .\l'l'liFI-'Rl'IN.

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